.img-ico {
    display: inline-block;
    width: 100%;
    height: 0;
    padding-bottom: 100%;
    background-size: cover;

    /*  白字纯色底图标 */
    &.btn_01 {
        background-image: url("../img/icon/btn_function_01.png")
    }
    &.btn_02 {
        background-image: url("../img/icon/btn_function_02.png")
    }
    &.btn_03 {
        background-image: url("../img/icon/btn_function_03.png")
    }
    &.btn_04 {
        background-image: url("../img/icon/btn_function_04.png")
    }
    &.btn_05 {
        background-image: url("../img/icon/btn_function_05.png")
    }
    &.btn_06 {
        background-image: url("../img/icon/btn_function_06.png")
    }
    &.btn_07 {
        background-image: url("../img/icon/btn_function_07.png")
    }
    &.btn_08 {
        background-image: url("../img/icon/btn_function_08.png")
    }
    &.btn_09 {
        background-image: url("../img/icon/btn_function_09.png")
    }
    &.btn_10 {
        background-image: url("../img/icon/btn_function_10.png")
    }
    &.btn_11 {
        background-image: url("../img/icon/btn_function_11.png")
    }
    &.btn_12 {
        background-image: url("../img/icon/btn_function_12.png")
    }
    &.btn_13 {
        background-image: url("../img/icon/btn_function_13.png")
    }
    &.btn_14 {
        background-image: url("../img/icon/btn_function_14.png")
    }
    &.btn_15 {
        background-image: url("../img/icon/btn_function_15.png")
    }
    &.btn_16 {
        background-image: url("../img/icon/btn_function_16.png")
    }
    &.btn_17 {
        background-image: url("../img/icon/btn_function_17.png")
    }
    &.btn_18 {
        background-image: url("../img/icon/btn_function_18.png")
    }

    /* 纯色无底图标 */
    &.ico-approve{
        background-image: url("../img/icon/icon_approve.png")
    }
    &.ico-coupon{
        background-image: url("../img/icon/icon_coupon.png")
    }
    &.ico-heart{
        background-image: url("../img/icon/icon_heart.png")
    }
    &.ico-invite{
        background-image: url("../img/icon/icon_invite.png")
    }
    &.ico-setting{
        background-image: url("../img/icon/icon_setting.png")
    }
    &.ico-share{
        background-image: url("../img/icon/icon_share.png")
    }
    &.ico-shopping{
        background-image: url("../img/icon/icon_shopping.png")
    }
    &.ico-switch{
        background-image: url("../img/icon/icon_switch.png")
    }

    /* 混色图标 */
    &.ico-box{
        background-image: url("../img/icon/color_box.png")
    }
    &.ico-building{
        background-image: url("../img/icon/color_building.png")
    }
    &.ico-coconut{
        background-image: url("../img/icon/color_coconut.png")
    }
    &.ico-taxi{
        background-image: url("../img/icon/color_taxi.png")
    }
}



// 复制到浏览器执行生.btn_(min-max)的样式
/* 
function fuckingBtn(min,max){
var result=``
for(var i=min;i<max+1;i++){
var idx=i<10?"0"+i:i,beforeText='../img/icon/btn_function_';
result+=
`&.btn_${idx} \{
    background-image: url("${beforeText}${idx}.png")
\}
`
}
console.log(result)
}
fuckingBtn(1,18)
*/